Forum adverts like this one are shown to any user who is not logged in. Join us by filling out a tiny 3 field form and you will get your own, free, dakka user account which gives a good range of benefits to you: No adverts like this in the forums anymore. Times and dates in your local timezone. Full tracking of what you have read so you can skip to your first unread post, easily see what has changed since you last logged in, and easily see what is new at a glance. Email notifications for threads you want to watch closely. Being a part of the oldest wargaming community on the net. If you are already a member then feel free to login now.

 Grey Templar wrote:

 LethalShade wrote:

 Grey Templar wrote:
If I recall correctly,its because gravity is more or less instant in its effects. Every atom in the universe has an effect on every other atom regardless of distance. Of course beyond certain distances the effect is very infantessimally small.

It kind of violates laws of physics, as you could use these "instant" effects to communicate faster than light.

That doesn't violate the laws of physics. You could reduce the communication time to effectively zero, only if it went negative would there be problems. Communication would be more or less instant, but that doesn't really cause issues. Its not like you could send a message to your past or future self.

If you communicate faster than the speed of light then you violate the laws of physics. You'll have a situation where, from the reference frame of the receiver, they got your message before you sent it. As all reference frames are equally valid you have now created a paradox as it means that in all reference frames, including your own, the message must have been received before it was sent. So you break causality.